feat: add support for injecting into unbound methods

[tlambert03]

No description provided.

[codecov]

Codecov Report

Merging #25 (9762e56) into main (1b6de73) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #25   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          486       497   +11     
=========================================
+ Hits           486       497   +11     

Impacted Files	Coverage Δ
src/in_n_out/_global.py	100.00% <ø> (ø)
src/in_n_out/_store.py	100.00% <100.00%> (ø)
src/in_n_out/_type_resolution.py	100.00% <100.00%> (ø)

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